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Gurmeet Singh posted an Question
August 02, 2020 • 00:10 am 30 points
  • IIT JAM
  • Geology (GG)

Sir, please explain these four lines.

Although the surfaces of glaciers can seem to consist of nothing but rock debris, most of the debris in a mature glacier is concentrated near its base. In fact basal ice may consist of only one part ice to every nine of sediment. The reason that the surfaces often seem so well coated in moraine are two fold. Firstly, the surface is the obvious place for debris from the valley walls to accumulate, and secondly, the surface is subjected to insolation and melting.

3 Answer(s) Answer Now
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    Rahul kumar best-answer

    Dear student, please ask in case of any clarification you need.

  • comment-profile-img>
    Sajan sarthak best-answer

    1. These lines are meant to explain the lower surface of glacier which is polished and and fine debris coated. because these debris comes from the valley and mountains and as it is of high dense than glacier goes down some are already in below when glacier moves the debris are polished . 2. Polished debris becomes adhesive when melted galcier water comes in contact which making it more prominent.Insolation means sunlight absorbance to glacier so that it will melt. 3. Again why mature glacier has these polished moraine because that glacier has undergone melting phases so many times.

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    what you could not understand??

    eduncle-logo-app

    sir i don't know...this topic i am not getting.

    eduncle-logo-app

    means i don't make any imagination

    eduncle-logo-app

    glacier topic.. which book are you following??

  • comment-profile-img>
    Rahul kumar Best Answer

    The theme of this paragraph is to convey that most of the sediments transported through glacier found at the base of the glacier. It is very obvious that glacier makes U-shaped valley and in order to generate that valley, glacier needs to break the rocks (generally by freeze thaw process). The broken rocks from valley walls accumulate at the base of glacier and transported by that. Moraine are the glacier deposit mainly consists of grain sizes greater than that of sand. Two fold reason of well coated surface in moraine seems obvious. As I have mentioned that most of the sediments get accumulated at the base of glacier and process like insolation and melting (continuous freeze and thaw) lead to the maturity of the debris found in moraine.

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    sir ye smj ni aaya- "Two fold reason of well coated surface in moraine seems obvious"

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    sir is this topic much important?

    eduncle-logo-app

    Actually the language used in the book is quite confusing. That sentence wants to convey that the coated nature of debris of moraine deposits resulted from accumulation of debris at the base of glacier and successive freeze and thaw, insolation and melting reorganize the moraine deposits.

    eduncle-logo-app

    This topic is not very much important from the exam perspective. However you should have the basic idea about glacial deposits.

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    ok i think move forward. with this much

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